Katherine Applegate

While at a meeting of The Sharing, Jake's father is threatened with Yeerk infestation at the hands of his own son, yet when Jake acts on a plan to help his father, his brain suddenly locks up and leaves him helpless at a very crucial time.

"Byx is the youngest member of her dairne pack. Believed to possess remarkable abilities, her mythical doglike species has been hunted to near extinction in the war-torn kingdom of Nedarra. After her pack is hunted down and killed, Byx fears she may be the last of her species. The Endling. So Byx sets out to find safe haven, and to see if the legends of other hidden dairnes are true. Along the way, she meets new allies--animals and humans alike--who...

Cassie is tired of battles and of being an Animorph, and decides that she just can't do it anymore. So she quits. But that's not the worst that's happended. A human-Controller followed Cassie after the last run-in with the Yeerks. And she knows that Cassie is an Andalite ... or human.

Rachel is falling apart. Literally. Her newest morph has the ability to regenerate its limbs, but when Rachel demorphs there's a lot more Rachel than when she started out. One more Rachel, to be exact. Rachel is an okay person to have around, but two could be considered overkill. Especially two Rachels with completely opposite personalities: one is pathetically weak; one is super strong and super nasty.Now the Animorphs have to figure out a way to...

Marco already knows he has a few problems. There's the constant battle with the Yeerks, and finding out his mother was infested by Visser One, the leader of the Yeerk invasion of Earth. But things are about to get even weirder. Marco's father is thinking of getting married again. Meanwhile, the Animorphs have other things to worry about. It seems the Yeerks are trying harder than ever to get people into The Sharing. Now the kids have to find a way...

Morphing into killer whales, the Animorphs discover a whole new world where humans with gills exist in the deep waters below.

Discovering that the Yeerks possess a weapon that can transform an Animorph back to a normal person with the flick of a switch, the Animorphs are forced to find a way to destroy their secret tool quickly or risk having their secret identitites exposed to all.

Tobias and the other Animorphs have seen things so bizarre that no sane person would believe their story. No one would believe that aliens have taken over the Earth, and are in the process of infesting as many humans as possible. No one could believe the battles and missions and losses these six kids have had to deal with. And it's not over yet. Tobias has been captured by the same human-Controller that nearly tortured him to death once before....

Almost nothing could be as bad as finding out your mother is Visser One, the most powerful leader of the Yeerk invasion of Earth. But it happened to Marco. And even though he's been handling it pretty well, he knew there'd come a time when he'd have to face her again, knowing that the Yeerk in her brain has taken his mother away.So when Marco and the other Animorphs discover that Visser One is overseeing a secret underwater project, they know they...

Marco is faced with a difficult decision when his mother threatens to seize control over Visser One.